Floral determination in axillary buds of Nicotiana silvestris |
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Affiliation: | 1. School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom;2. GeoEnergy Research Centre, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom;3. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom;1. Institute of Tea Science, Zhejiang University, Hangzhou, 310058, Zhejiang Province, China;2. Institute of Tea Science, Qingdao Agricultural University, Qingdao, 266109, Shandong Province, China;3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, Jiangsu Province, China;1. Research Center of Nematodes of Plant Quarantine, Laboratory of Plant Nematology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, P.R.China;2. Technology Center, Guangzhou Customs District, People''s Republic of China, Guangzhou 510623, P.R.China;3. Comprehensive Technology and Service Center of Huizhou Port Customs, Huizhou 516080, P.R.China |
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Abstract: | At anthesis of the terminal flower the developmental fates of axillary buds of the long-day plant Nicotiana silvestris were assessed in situ and in isolation. The in situ developmental fate was assessed by decapitating the plant above the bud in question and letting the bud mature. The developmental fate of isolated buds was assessed by removing the bud from the main axis, rooting it, and letting it mature. The number of nodes below the terminal flower of the mature shoot was indicative of the developmental fate of the bud. Terminal meristems of rooted axillary buds exhibited two patterns of development: (1) Their developmental fate was the same as that of in situ buds at the same node or (2) their developmental fate was the same as that of seed-derived plants. For example, terminal meristems of rooted buds from the fourth node below the inflorescence produced either 15 to 19 nodes or 36 to 40 nodes. In situ fourth buds produced 12 to 14 nodes while seed-derived plants produced 33 to 39 nodes. Terminal meristems of rooted axillary buds that exhibited the same developmental fate as that of in situ buds were determined for floral development. Although determined buds produced a terminal flower, all but one had abnormal inflorescences. That is, in the place of floral branches determined buds produced vegetative branches. Four buds that were not determined for floral development had their shoot tips rooted each time the plant bolted. Only when the plants were allowed to grow without being rerooted did they flower. These results indicate that roots may prevent and/or destabilize floral determination in N. silvestris. |
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